<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allChecked" />
    </label>
    <span>
      <span>已完成{{ getNum }}</span> / 全部{{ todoList.length }}
    </span>
    <button class="btn btn-danger" @click="deleteAllFinish">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todoList", ],
  computed: {
    allChecked: {
      get() {
        return (
          this.todoList.every((item) => {
            return item.done;
          }) && this.todoList.length !== 0
        );
      },

      set(done) {
        this.$emit("setAllChecked", done);
      },
    },
    getNum() {
      return this.todoList.reduce((p, c) => {
        return c.done ? p + 1 : p;
      }, 0);
    },
  },
  methods: {
    deleteAllFinish() {
      this.$emit("deleteAllFinish");
    },
  },
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>